Dual-Energy CT: General Principles

被引：439

作者：

Johnson, Thorsten R. C. ^{[1
]}

机构：

[1] Univ Munich, Hosp Munich, Inst Clin Radiol, D-81377 Munich, Bavaria, Germany

来源：

AMERICAN JOURNAL OF ROENTGENOLOGY | 2012年 / 199卷 / 05期

关键词：

CT detector technology; dual-energy CT; dual-source CT; rapid voltage switching; spectral CT; COMPUTED-TOMOGRAPHY; BONE REMOVAL; CONTRAST; ANGIOGRAPHY; EXPERIENCE; IMAGE; NOISE;

D O I：

10.2214/AJR.12.9116

中图分类号：

R8 [特种医学]; R445 [影像诊断学];

学科分类号：

1002 ; 100207 ; 1009 ;

摘要：

OBJECTIVE. In dual-energy CT (DECT), two CT datasets are acquired with different x-ray spectra. These spectra are generated using different tube potentials, partially also with additional filtration at 140 kVp. Spectral information can also be resolved by layer detectors or quantum-counting detectors. Several technical approaches-that is, sequential acquisition, rapid voltage switching, dual-source CT (DSCT), layer detector, quantum-counting detector-offer different spectral contrast and dose efficiency. Various postprocessing algorithms readily provide clinically relevant spectral information. CONCLUSION. DECT offers the possibility to exploit spectral information for diagnostic purposes. There are different technical approaches, all of which have inherent advantages and disadvantages, especially regarding spectral contrast and dose efficiency. There are numerous clinical applications of DECT that are easily accessible with specific postprocessing algorithms.

引用

页码：S3 / S8

页数：6

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